A centrifugal fan is to be used to take a flue gas at rest ( zero velocity) and at a temperature of 352.6K and a pressure of 749.3 mmHg and discharge that gas at pressure of 800.1 mmhg and a velocity of 38.1 m/s. The volume flow rate of gas is 56.6 std m^3/min of gas ( at 294.3K and 760 mmHg). Calculate the brake KW of the fan and its efficiency is 65% and the gas has a molecular weight of 30.7. assume incompressible flow.